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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6202a0ede5283272cab62f42d7902311c76b07030ec0bf628b877ae6e3b5ec4' 
  AND token = 'zXV8brhzjuDLpDDJfY3VDOk1cbcw4haEyVBqTzw/thE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}